The terrorism threat level has been raised from ‘substantial’ to ‘severe’ for specific transport hubs such as UK airports as well as London transport, following new intelligence pointing towards a Mumbai-style attack.

Extra police have been deployed at the specific locations including airports as well as train and tube stations to deal with the suspected terrorism threat.

A Yard spokesman said: “We will police accordingly and use a range of covert and overt tactics which remain under constant review.”

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He added: “Recent events at East Midlands Airport and continued speculation about ‘Mumbai-style’ attacks serve as a stark reminder of the real and enduring threat we continue to face from terrorist groups.”

A spokesman for airport operator BAA said: “Security at our airports remains at a high level, and we remain vigilant at all times”.

The overall national security threat level for the UK, which was introduced a year ago, remains at its second-highest level ‘severe’.